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IAUC 4519: 0535-668; V842 Cen (N Cen 1986); 1987b1

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                                                  Circular No. 4519
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


0535-668
     I. Thompson, Mount Wilson and Las Campanas Observatories,
reports that the LMC x-ray pulsar binary 0535-668 (A0538-66) has
entered an active phase.  Spectra taken with the du Pont 2.5-m
telescope and 2D-frutti detector on Dec. 24.08 UT (at phase 0.950
assuming a period of 16.6515 days and the ephemeris of Hutchings
et al. 1985, PASP 97, 418) show strong He II 469-mm emission.  H,
He I and C III/N III 463-464-nm emission is also present.  Spectra
taken on Dec. 23.26 UT (phase 0.901) show only weak H beta.


V842 CENTAURI (NOVA CENTAURI 1986)
     Magnitude estimates by R. H. McNaught (using V sequence by P.
Kilmartin): Feb. 22.79, 11.5 (updated from IAUC 4316); Mar. 19.80,
11.9; Apr. 21.6, 11.5; May 30.68, 11.1; June 28.43, 11.0; July
24.52, 10.9; Aug. 20.43, 11.0; Sept. 18.39, 10.5; Nov. 20.74,
11.1; Dec. 24.72, 11.2.  He suggests from comparison with FH Ser
that V842 Cen should now be a prominent radio source.


COMET McNAUGHT (1987b1)
     Ephemeris from the orbital elements on MPC 12575:

     1987/88 ET   R.A. (1950) Decl.     Delta      r       m1
     Dec. 31    17 54.52    + 0 48.4    1.689    0.914     7.2
     Jan.  5    18 06.24    + 5 18.9
          10    18 18.67    + 9 59.3    1.620    0.998     7.5
          15    18 31.99    +14 49.6
          20    18 46.36    +19 48.6    1.566    1.104     7.9
          25    19 01.96    +24 53.9
          30    19 19.00    +30 01.7    1.542    1.222     8.3
     Feb.  4    19 37.71    +35 06.8
           9    19 58.33    +40 03.0    1.562    1.348     8.8
          14    20 21.11    +44 44.1
          19    20 46.25    +49 03.7    1.629    1.478     9.3

     Total visual magnitude estimates: Oct. 20.4 UT, 9.3 (A.
Jones, Nelson, New Zealand, 0.32-m reflector); 27.42, 8.6 (D.
Seargent, The Entrance, N.S.W., 15 x 80 binoculars, poor
conditions); 27.42, 8.3 (R. H. McNaught, Siding Spring Observatory,
20 x 120 binoculars; faint, diffuse 4' tail in p.a. 190 deg).


1987 December 26               (4519)              Brian G. Marsden

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